Last two usages in RFH:
- media interface registry
- java interface provider bridge

both replaced by ad-hoc InterfaceProvider impls

R=rockot@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2847743003
Cr-Commit-Position: refs/heads/master@{#468492}